i have a Shindaiwa 630 Blower and the air filter cover has come off severall times when the blower was put in the back of the truck. Some times we noticed and sometimes we didn't immediately. Any one else had problems. The cover should screw on like Sthil and others. Any ideas on how to keep it on. I was thinking on slipping a sock over the top and slitting it at the carburetor.